/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlinePartyInterface.h
Request to join party async task completed callback
typedef TBaseDelegate_FourParams< void, const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) &, const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) &, const [FDateTime](API\Runtime\Core\Misc\FDateTime) &, const [ERequestToJoinPartyCompletionResult](API\Plugins\OnlineSubsystem\Interfaces\ERequestToJoinPartyCompletionRes-) > FOnRequestToJoinPartyComplete